The Dometic thermostatic expansion valve (TXV) regulates refrigerant flow in your RV air conditioning system, maintaining optimal cooling performance and system efficiency. This R-22 compatible valve is essential for RV owners experiencing reduced AC cooling, temperature fluctuations, or compressor issues related to improper refrigerant metering.
- Thermostatic operation automatically adjusts refrigerant flow based on evaporator temperature
- R-22 refrigerant compatible for legacy RV cooling systems
- 3/4 VW (Valve Weld) connection for secure, leak-free installation
- Prevents liquid slugging and compressor damage from improper refrigerant distribution
- OEM Dometic engineering ensures compatibility with original RV AC systems
- Direct replacement for failed or underperforming expansion valves
| Specification | Detail |
|---|---|
| Part Number | 290000129 |
| Refrigerant Type | R-22 |
| Connection Size | 3/4 VW (Valve Weld) |
| Valve Type | Thermostatic Expansion Valve |
| Manufacturer | Dometic |
Frequently Asked Questions
Q: How do I know if my expansion valve needs replacement?
A: Signs include weak or no cold air from vents, ice buildup on AC lines, compressor cycling on and off rapidly, or hissing sounds from the AC unit. A failing TXV cannot properly meter refrigerant flow.
Q: Will this valve work with my RV's R-22 system?
A: Yes, this valve is specifically designed for R-22 refrigerant systems common in older and mid-range RV air conditioning units. Do not use with R-410A systems.
Q: Do I need professional installation?
A: Thermostatic expansion valve replacement requires AC system evacuation and recharging. We recommend having a certified RV technician perform the installation to ensure proper refrigerant handling and system performance.
Why Elkhart RV Parts
We specialize in hard-to-find Dometic replacement parts and ship directly from Elkhart, Indiana — the RV capital of the world. Every part is genuine OEM Dometic equipment backed by expert support to help you get your RV cooling system running smoothly again.
| Brand | Dometic |
|---|---|
| Product type | Thermostatic Expansion Valve |
| Part number | 290000129 |
| Refrigerant type | R-22 |
| Valve size | 3/4 VW |
| Oem | true |
| Application | RV Air Conditioning Systems |
| Function | Regulates refrigerant flow |
| Installation | Professional service recommended |
| Condition | New |
Factory-Fresh OEM Parts — the same brands installed in new RVs straight from Elkhart. Genuine, name-brand components made to order — never generic, never outdated. Sourced directly from the original RV manufacturers for perfect fit and factory-level quality.